Unfortunately there is no direct link to the NEHOL database. You can find the link in the left column of http://corpus1.mpi.nl/ds/imdi_browser/. Please select to open the manual for the use of NEHOL: The Negerhollands Database or the Negerhollands sources.
Please send us your questions or comments! Note that Robbert van Sluijs knows most about the use of the CLARIN-Nehol database.
Cefas van Rossem
UPDATE March 7, 2014:
Updated version of the manual